Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 96, NWS Melbourne, FL

December 10, 2012Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Dec 10, 2012, 5:08 PM EST for Volusia County, Florida. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Dec 10, 2012, 5:08 PM EST (22:08 UTC)
Expired
Dec 10, 2012, 5:45 PM EST
In force
37 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

County Volusia County, FL

The radar

The Jacksonville radar (KJAX), 130 km from the middle of the area, began a volume at 22:08 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.1 hours before the alert went out and 132 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2012-12-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2012-12-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

565 
WUUS52 KMLB 102208
SVRMLB
FLC127-102245-
/O.NEW.KMLB.SV.W.0096.121210T2208Z-121210T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
508 PM EST MON DEC 10 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 545 PM EST.

* AT 506 PM EST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR LAKE GEORGE...OR 9 MILES
  NORTHWEST OF PIERSON...AND MOVING NORTHEAST AT 35 MPH.

THIS STORM HAS ALSO EXHIBITED WEAK ROTATION AND A FUNNEL CLOUD MAY 
BE POSSIBLE.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  SEVILLE AND BAKERSTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR AND OR LARGE DESTRUCTIVE HAIL. FREQUENT TO EXCESSIVE LIGHTNING
AND VERY HEAVY RAIN WILL ALSO BE POSSIBLE. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.

&&

LAT...LON 2929 8142 2921 8162 2930 8166 2931 8168
      2932 8168 2934 8166 2938 8145 2940 8143
      2940 8142
TIME...MOT...LOC 2208Z 242DEG 29KT 2931 8157

$$

SEDLOCK
2 follow-up statements
472 
WWUS52 KMLB 102221
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
521 PM EST MON DEC 10 2012

FLC127-102245-
/O.CON.KMLB.SV.W.0096.000000T0000Z-121210T2245Z/
VOLUSIA-
521 PM EST MON DEC 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EST
FOR NORTHWESTERN VOLUSIA COUNTY...

AT 516 PM EST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BAKERSTOWN...OR 8
MILES NORTHWEST OF PIERSON...MOVING NORTHEAST AT 30 MPH.

THIS STORM CONTINUES TO EXHIBIT ROTATION. FUNNELS CLOUDS WILL BE 
POSSIBLE.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF ON OR NEAR LAKE GEORGE...GET OUT OF THE WATER AND MOVE INDOORS OR 
INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES 
FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE 
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. 
DON'T BE CAUGHT ON THE WATER IN A THUNDERSTORM!

&&

LAT...LON 2929 8142 2928 8154 2929 8157 2931 8159
      2932 8161 2934 8162 2938 8145 2940 8143
      2940 8142
TIME...MOT...LOC 2220Z 226DEG 28KT 2936 8151

$$

SEDLOCK
727 
WWUS52 KMLB 102236
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
536 PM EST MON DEC 10 2012

FLC127-102246-
/O.EXP.KMLB.SV.W.0096.000000T0000Z-121210T2245Z/
VOLUSIA-
536 PM EST MON DEC 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN VOLUSIA COUNTY
WILL EXPIRE AT 545 PM EST...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED
THE WARNING AREA...THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 2929 8142 2928 8154 2929 8157 2931 8159
      2932 8161 2934 8162 2938 8145 2940 8143
      2940 8142
TIME...MOT...LOC 2236Z 226DEG 28KT 2945 8141

$$

SEDLOCK

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 10, 2:53 PM ESTSpecial Weather StatementMLBOkeechobee52 min
Dec 10, 3:39 PM ESTSpecial Weather StatementMLBIndian River, Okeechobee51 min
Dec 10, 3:50 PM ESTSpecial Weather StatementMLBOrange, Seminole55 min
Dec 10, 4:13 PM ESTTornado WarningMLBLake, Orange, Seminole47 min
Dec 10, 4:28 PM ESTTornado WarningMLBSeminole, Volusia47 min
Dec 10, 4:29 PM ESTSpecial Weather StatementMLBSaint Lucie46 min
Dec 10, 4:33 PM ESTSpecial Marine WarningMLB117 min
Dec 10, 4:42 PM ESTTornado WarningMLBIndian River, Saint Lucie48 min
Dec 10, 4:59 PM ESTTornado WarningMLBSeminole, Volusia46 min
Dec 10, 5:02 PM ESTTornado WarningMLBVolusia43 min
Dec 10, 5:09 PM ESTTornado WarningMLBSeminole, Volusia21 min
Dec 10, 5:23 PM ESTSpecial Marine WarningMLB112 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.